Portion of a lamp



FIG. 1 is an isometric view of a top, front, and left side of anornamental design for a portion of a lamp;

FIG. 2 is a top plan view of a portion of a lamp of FIG. 1;

FIG. 3 is a rear elevational view of a portion of a lamp of FIG. 1;

FIG. 4 is a front elevational view a portion of a lamp of FIG. 1;

FIG. 5 is right-side elevational view of a portion of a lamp of FIG. 1;

FIG. 6 is a left-side elevational view of a portion of a lamp of FIG. 1;and,

FIG. 7 is a bottom plan view of a portion of a lamp of FIG. 1.

The subject matter shown in dashed lines is for illustrative purposesonly and forms no part of the claimed invention.

CLAIM The ornamental design for a portion of a lamp, as shown anddescribed herein.